RM0312 datasheet(196/275 Pages) STMICROELECTRONICS

tên linh kiện	RM0312

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Inter-integrated circuit (I2C) interface

RM0312

196/275

DocID022352 Rev 3

19.7.12

Clock control register low (I2C_CCRL)

Address offset: 0x02

Reset value: 0x0B

654

3210

CCR[7:0]

Bits 7:0 CCR[7:0] Clock control register (Master mode)

Controls the SCLH clock in Master mode.

– Standard mode:

Period(I2C) = 2 * CCR * tMASTER

thigh = CCR * tMASTER

tlow = CCR * tMASTER

– Fast mode:

If DUTY = 0:

Period(I2C) = 3* CCR * tMASTER

thigh = CCR * tMASTER

tlow = 2 * CCR * tMASTER

If DUTY = 1: (to reach 400 kHz)

Period(I2C) = 25 * CCR * tMASTER

thigh = 9 * CCR * tMASTER

tlow = 16 * CCR * tMASTER

Note: tCK = 1/ fMASTER. fMASTER is the input clock to the peripheral configured using clock control

The minimum allowed value is 04h, except in FAST DUTY mode where the minimum allowed

value is 0x01.

thigh = tr(SCL) + tw(SCLH). See device datasheet for the definitions of parameters.

tlow = tf(SCL) + tw(SCLL). See device datasheet for the definitions of parameters.

I2C communication speed, fSCL = 1/(thigh + tlow)

The real frequency may differ due to the analog noise filter input delay.

RM0312 bảng dữ liệu(PDF) 196 Page - STMicroelectronics